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What is the value of (vecA + vecB) * ( v...

What is the value of `(vecA + vecB) * ( vecA xx vecB)` ?

A

0

B

`A^(2) - B^(2)`

C

`A^(2) + B^(2) + 2AB`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
1
Let `vecR= vecA + vecB and vecC= vecA xx vecB`
thus, `vecC` is `bot` to plane of `vecA and vecB and vecC bot vecR` also
`vecC*vecR= 0 rArr (vecA + vecB)*(vecA xx vecB)=0`
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